.container {
    overflow: hidden;
    align-items: center;
    justify-content: center;

    width: 100%;
    height: 24px;

    .bar {
      width: 4px;
      min-height: 6px;
      max-height: 24px;

      background-color: #AAA;
      border-radius: 8px;

      transition: height 0.1s ease-in-out; /* 设置过渡效果 */
    }
  }